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Table 1 Sampled taxa and microscopic teeth character described for individual specimen

From: Ultramicrostructural reductions in teeth: implications for dietary transition from non-avian dinosaurs to birds

SpeciesEnamel feature (Terminology follows that in Hwang 2005)Enamel Thickness (μm)Crown height (μm)Ratio (Enamel thickness/Crown height)Interglobular porous mantle dentinInferred diet/feeding ecologyImaging method
Indet. Ornithurine (IVPP V 14606)Simple parallel crystallite6.511190.58%AbsentHerbivorousμCT/SEM/TXM
Indet. Enantiornithine (IVPP V 16041)Columnar enamel6.23461.8%AbsentInsectivoreSEM/TXM
Longipteryx chaoyangensis (IVPP V 21702)Columnar enamel with Crystal bundle and microunits50.012604%AbsentPiscivoreμCT/SEM/TXM
Sapeornis changyangensis (IVPP V 13759)Columnar enamel, with partially converging crystallite21.016311.3%AbsentSeeds/ herbivorousSEM/TXM
Jeholornis prima (IVPP V 13886)Simple paralleled, poorly defined structure, appeared to have a few incremental lines7.029560.2%AbsentSeeds/ herbivorousμCT/SEM
Microraptorine 1 and 2Stm 5–151Parallel crystallite enamel, with a few incremental lines close to the surface11.1  PresentCarnivorous: lizard, bird, small animalsSEM/TXM
Stm 5–48Thin parallel crystallite7.1  Absent?SEM/TXM
Troodontid sp.Parallel crystallite26.3  PresentGeneral carnivorousSEM/TXM
Anchiornis huxleyi (Stm 0–69)Parallel crystallite14.3  PresentCarnivorous: Lizard, fish,/opportunistic feedersSEM/TXM